Because your changes are in a branch, this is the revised process to test the new version;
cd ~
git clone --single-branch --branch dropbox-refresh-token-refactored https://github.com/bartbutenaers/node-red-web-nodes
cd node-red-web-nodes/dropbox
npm install
cd ~/.node-red
npm install ~/node-red-web-nodes/dropbox
node-red-stop;node-red-start
@BartButenaers - I've repeated the whole process 3 times this morning, and uploaded numerous sample files without issue. It was very quick & easy, and the instructions are very clear 
The only suggestion I'd make would be to change the button label top right of node properties from 'Update' to 'Save', which may be a more natural process for users.
